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Author email
[email protected]
Author website
www.rickeyworld.info

Description



DS1307 is a hardware realtime clock, which works on I2C protocol. Better graphics using the same old fashioned alphanumeric LCD (type HD44780). Icons which shows the status for Alarm ON/OFF state, which gives a nice and cute look to the clock.

There are four switches connected to the uC, as shown in the figure. Function of the keys are same as clear from their names.

When the power supply is switched on it will give you the default date and time, but later you can change it to the desired value. After setting once, the backup battery will keep the clock ticking even after the power is not there.

A little about I2C:
There are basically four main conditions in I2C protocol.
1) Start Condition
2)Stop Condition
3)Data Validity
4)Acknowledgement

1)Start Condition:
when SCL is high and SDA H->L, will be taken as start condition for the communication.
2)Stop Condition:
when SCL is high and SDA L->H, will generate a stop condition.
3)Data Validity:
When SCL is high there should be no chande in SDA line only then the data is valid, the data change should be made only when SCL is low.
4)Acknowledgement:

After sending of one byte of data the reciever has to acknowledge the sender for the successful reception. for this the sender make the SDA line high and reciever pulls down the SDA low, which tells the sender that data has reached safely.

Now the source code written in assembly, basically implements the I2C protocol. the assembly source written for Keil download here clock.asm and the direct hex file for programming the controller from here clock.hex. The schematic for the Digital clock is available in PDF format can be downloaded from here clock.pdf.

Project code has been revised and updated. Bug fixes regarding corrupt display.

History:
First Upload date:
08/05/2006
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Conversation

Sun May 24 2015, 06:51 AM
Subrat Sahu
I have a confusion about 10 bit adc formula as describe bellow that resolution = Vref/1023 or Vref / 1024
Sun May 24 2015, 06:49 AM
Subrat Sahu
I have a confusion about 10 bit adc formula as describe bellow,
ExperimenterUK
Sat May 23 2015, 08:54 PM
@utpal.. Create a thread in the Pic forum
Thu May 21 2015, 01:04 AM
utpal
i am a hobbist. i work on 8051. just i have started with pic 16f877. but a bitter experiance is going on. as i am programming any code to my pic877 and putting it in my board and it is working, but the 2nd time it is not taking any program,I have experimented just 7 new one pic mcus. result is the same. please tell me the reason. my programmer is TOP3000(universal programmer).
ajay_bhargav
Wed May 20 2015, 04:48 AM
@lak you can use the same code provided you are not using any s52 specific ports and registers.
Mon May 18 2015, 05:58 AM
lak
i used to develop a code for at89s52 shall i use the same code for at89c4051
Sun May 17 2015, 07:57 AM
Ayoosh
what if i have to rotate motor continuously at a step angle of 1.8 degree
ExperimenterUK
Fri May 15 2015, 06:02 PM
@oracle1946.. Post your question in the PIC forum
Fri May 15 2015, 03:48 AM
nadeem232
if some has solution kindly share solution Principles of Electric Circuits,by Thomas L. Floyd
oracle1946
Thu May 14 2015, 03:39 PM
I want to build a PIC16F684 sun logger using either a solar cell (0.5v solar cell or photoresistor). Any help out there?

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MuhammadTanvir
Sun May 24 2015, 11:02 AM
as_rog
Sun May 17 2015, 08:00 AM
oracle1946
Thu May 14 2015, 03:34 PM
kakaru32
Tue May 12 2015, 04:29 PM
Yateesh
Sat May 09 2015, 02:46 AM
scmg
Fri May 08 2015, 06:40 PM
OMERO
Fri May 08 2015, 11:53 AM
Carlos55
Fri May 08 2015, 02:14 AM

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MuhammadTanvir Avatar
Posted By MuhammadTanvir
Sun May 24 2015, 11:11 AM
Hey guys !! Can somebody please share the proteus ...
MuhammadTanvir Avatar
Posted By MuhammadTanvir
Sun May 24 2015, 11:07 AM
Hey guys !! Can somebody please share the proteus ...
ExperimenterUK Avatar
Posted By ExperimenterUK
Sat May 23 2015, 09:52 PM
Does the speaker work?.'Exactly' where on the boa...
ExperimenterUK Avatar
Posted By ExperimenterUK
Sat May 23 2015, 09:44 PM
For all your questions there is a proper, very tec...
mayank058 Avatar
Posted By mayank058
Thu May 21 2015, 04:46 AM
dear sir there is nothing to zip.I just...
ajay_bhargav Avatar
Posted By ajay_bhargav
Wed May 20 2015, 04:57 AM
can you zip your complete project and attach it he...
ajay_bhargav Avatar
Posted By ajay_bhargav
Wed May 20 2015, 04:46 AM
If you know how to drive 7-seg using an 8-bit port...
ajay_bhargav Avatar
Posted By ajay_bhargav
Wed May 20 2015, 04:42 AM
There was no proteus file included in the package,...
ankitbajaj01 Avatar
Posted By ankitbajaj01
Tue May 19 2015, 07:00 AM
Hello ExperimenterUK...Please guide me on above po...
mayank058 Avatar
Posted By mayank058
Tue May 19 2015, 04:54 AM
Sir I want to measure the analog signal on CRO.